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Published on: 13/10/2020
12th Standard Chemistry Biomolecules English Medium Free Online Test One Mark Questions 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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1.
Lactose on hydrolysis gives
two molecules of glucose
glucose and fructose
two molecules of fructose
glucose and galactose
2.
Sucrose contains glucose and fructose linked by
C1 - C1
C1 - C2
C1 - C4
C1 - C6
3.
When starch is heated to 200°C - 250°C, the product is
dextrin
caramel
barley sugar
cellulose
4.
Carbohydrates in which large number of monosaccharide units linked to each other by oxide bridges are
non-sugars
polysaccharides
tetrasaccharides
both (a) and (b)
5.
The number of primary and secondary alcoholic groups in fructose is
2,3
3,2
4,3
5,4
6.
The storage of energy in plants and animals are
oils and fats
proteins
carbohydrates
vitamins
7.
Specificity of enzyme is due to
the sequence of amino acids
secondary structure
tertiary structure
all of the above
8.
Two amino acids say A, B react to give
two dipeptides
three dipeptides
four dipeptides
only one
9.
Inversion of sucrose refers to
oxidation of sucrose
reduction of sucrose
hydrolysis of sucrose to glucose and fructose
polymerisation of sucrose
10.
Sucrose contains glucose and fructose linked by
C1 - C1
C1 - C2
C1 - C4
C1 - C6
11.
Which among the following is called fruit sugar?
Glucose
Fructose
Sucrose
Maltose
12.
Which of the following amino acids are achiral?
Alanine
Leucine
Proline
Glycine
13.
If one strand of the DNA has the sequence ‘ATGCTTGA’, then the sequence of complementary strand would be ______.
TACGAACT
TCCGAACT
TACGTACT
TACGRAGT
14.
Which of the following vitamins is water soluble?
Vitamin E
Vitamin K
Vitamin A
Vitamin B
15.
Among the following L- serine is ______.
16.
Vitamin B2 is also known as ______.
Riboflavin
Thiamine
Nicotinamide
Pyridoxine
17.
The correct statement regarding RNA and DNA respectively is ______.
the sugar component in RNA is an arabinos and the sugar component in DNA is ribose
the sugar component in RNA is 2’-deoxyribose and the sugar component in DNA is arabinose
the sugar component in RNA is an arabinose and the sugar component in DNA is 2’-deoxyribose
the sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose
18.
In a protein, various amino acids linked together by ______.
Peptide bond
Dative bond
\(\alpha\) - Glycosidic bond
\(\beta\) - Glycosidic bond
19.
Which one of the following rotates the plane polarized light towards left?
D(+) Glucose
L(+) Glucose
D(-) Fructose
D(+) Galactose
20.
Assertion: A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of little hydrochloric acid, it becomes levorotatory.
Reason: Sucrose hydrolysis gives unequal amounts of glucose and fructose. As a result of this change in sign of rotation is observed.
Codes:
a) If both accretion and reason are true and reason is the correct explanation of assertion.
b) If both assertion and reason are true but reason is not the correct explanation of assertion.
c) If assertion is true but reason is false.
d) if both assertion and reason are false.
If both accretion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
if both assertion and reason are false.
1.
(d)
glucose and galactose
2.
(b)
C1 - C2
3.
(a)
dextrin
4.
(d)
both (a) and (b)
5.
(a)
2,3
6.
(a)
oils and fats
7.
(d)
all of the above
8.
(d)
only one
9.
(c)
hydrolysis of sucrose to glucose and fructose
10.
(b)
C1 - C2
11.
(b)
Fructose
12.
(d)
Glycine
13.
(a)
TACGAACT
14.
(d)
Vitamin B
15.
(c)
16.
(a)
Riboflavin
17.
(d)
the sugar component in RNA is ribose and the sugar component in DNA is 2’-deoxyribose
18.
(a)
Peptide bond
19.
(c)
D(-) Fructose
20.
a) If both accretion and reason are true and reason is the correct explanation of assertion.
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